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做了3年开发了，最近发现基础还是很重要，应该是深博，而不是博深，陆续贴点基础类

记录日志 

using System;
using System.IO;
using System.Text;namespace TestForLogfile
{
    public class LogFile
    {
        //private static readonly string LogFileName = ConfigurationManager.AppSettings["LogFile"];
        private static readonly string LogFileName = "TestLogFile";public static void LogInfo(string sLogInfo, LogType type)
        {
            try
            {
                string logLevelType = GetStringLogType(type);

                var sb 

= new StringBuilder();
                sb.Append(DateTime.Now.ToString("MM/dd HH:mm:ss "));
                sb.Append("  ");
                sb.Append(logLevelType);
                sb.Append("  ");
                sb.Append(sLogInfo);

                var filePathAndName 

=
                    string.Format("{0}AppLog\\{1}.txt", AppDomain.CurrentDomain.BaseDirectory, LogFileName);//write to file TecNodeService.log
                using (var fs = File.Open(filePathAndName, FileMode.Append, FileAccess.Write, FileShare.Write))
                {
                    var logFileSW = new StreamWriter(fs);
                    logFileSW.WriteLine(sb.ToString());
                    logFileSW.Close();
                    fs.Close();
                }

            }

catch (Exception ex)
            {
                //write to file TecNodeServiceErr.txt
                string errFilePathAndName = string.Format("{0}{1}", AppDomain.CurrentDomain.BaseDirectory, LogFileName);try
                {
                    var fs = File.Open(errFilePathAndName, FileMode.Append, FileAccess.Write, FileShare.Write);
                    var logFileSW = new StreamWriter(fs);
                    logFileSW.WriteLine(ex.Message);
                    logFileSW.Close();
                    fs.Close();
                }
                catch
                {
                }
            }
        }private static string GetStringLogType(LogType type)
        {
            string logLevelType;switch (type)
            {
                case LogType.Trace:
                    {
                        logLevelType = "Trace";
                        break;
                    }
                case LogType.Info:
                    {
                        logLevelType = "Info";
                        break;
                    }
                case LogType.Warning:
                    {
                        logLevelType = "Warning";
                        break;
                    }
                case LogType.Error:
                    {
                        logLevelType = "Error";
                        break;
                    }
                case LogType.Start:
                    {
                        logLevelType = "Start";
                        break;
                    }
                case LogType.Stop:
                    {
                        logLevelType = "Stop";
                        break;
                    }
                default:
                    {
                        logLevelType = "Unknown";
                        break;
                    }
            }
            return logLevelType;
        }public static void RenameLogFile(int numCopy)
        {
            //find the location of log file
            string baseDirPath = AppDomain.CurrentDomain.BaseDirectory;
            string logPath = baseDirPath + "AppLog";
            if (!Directory.Exists(logPath))
            {
                // Create log file
                Directory.CreateDirectory(logPath);
            }// logfile path
            string logFile = string.Format("{0}AppLog\\{1}.txt", baseDirPath, LogFileName);
            FileInfo logFileInfo = new FileInfo(logFile);
            if (logFileInfo.Exists)
            {
                // recursive rename
                RecursiveRenameFile(logFile, numCopy);
                logFileInfo.Delete();
            }
        }private static void RecursiveRenameFile(string fullName, int numCopy)
        {
            var logFileInfo = new FileInfo(fullName);
            try
            {
                if (logFileInfo.Exists)
                {
                    //For example:  TestLogFile2.txt
                    int iLastDotPos = fullName.LastIndexOf('.');  //13
                    int iFileNamePos = fullName.LastIndexOf(LogFileName); //0
                    int iStartNumPos = iFileNamePos + LogFileName.Length;
                    string nextFilePathAndName;
                    int iSeqNum;
                    if (iStartNumPos == iLastDotPos)
                    {
                        iSeqNum = 1;
                        nextFilePathAndName = fullName.Substring(0, iStartNumPos) + iSeqNum + ".txt";
                    }
                    else
                    {
                        iSeqNum = Int32.Parse(fullName.Substring(iStartNumPos, iLastDotPos - iStartNumPos)) + 1;
                        nextFilePathAndName = fullName.Substring(0, iStartNumPos) + iSeqNum + ".txt";
                    }if (iSeqNum < numCopy)
                    {
                        RecursiveRenameFile(nextFilePathAndName, numCopy);
                    }
                    logFileInfo.CopyTo(nextFilePathAndName, true);
                }
            }
            catch (Exception ex)
            {
                LogInfo(ex.Message, LogType.Error);
            }
        }
    }public enum LogType
    {
        Trace = 0,
        Info,
        Warning,
        Error,
        Start,
        Stop,
        Unknown
    }
}

调用很简单

//9表示保留9个日志文件，循环向后拷贝
LogFile.RenameLogFile(9);

// 记录日志内容
LogFile.LogInfo("test", LogType.Error);